package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestBody;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    protected DishFlavorMapper dishFlavorMapper;
    @Autowired
    protected SetmealDishMapper setmealDishMapper;

    /*
     * 新增菜品和对应口味
     * */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO){
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);
        //获取insert语句生成的主键值
        Long dishId = dish.getId();
        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
           flavors.forEach(dishFlavor -> {
               dishFlavor.setDishId(dishId);
           });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /*
    * 菜品分页查询
    * */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    @Transactional
    /*
     * 菜品的批量删除
     * */
    public void deleteBatch(List<Long> ids) {
        //菜品是否可以删除-是否存在
            for (long id :ids){
               Dish dish = dishMapper.getById(id);
               if(dish.getStatus() == StatusConstant.ENABLE){
                   //当前菜品处于起售，不能删除
                   throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
               }
        }
        //菜品是否被关联-是否被套餐关联
            List<Long> setmealIds =  setmealDishMapper.getSetmealIdsByDishIds(ids);
            if (setmealIds != null && setmealIds.size() >0){
                //当前菜品被套餐关联，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }
        //删除菜品表中菜品数据
            /*for (Long id :ids){
                dishMapper.deleteById(id);
                //删除菜品关联的口味数据
                dishFlavorMapper.deleteByDishId(id);
            }*/

            //根据菜品id集合批量删除菜品数据
            //sql: delete from dish where id in (?,?,?)
            dishMapper.deleteByIds(ids);
            //根据菜品id集合批量删除关联的口味数据
            //sql: delete from dish_Flavor where dish_id in (?,?,?)
            dishFlavorMapper.deleteByDishIds(ids);

    }

    /*
     *根据id查询菜品和对应的口味数据
     * */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishMapper.getByDishId(id);
        //将查询到的数据封装到vo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /*
     * 根据id修改菜品的基本信息和对应的口味信息
     * */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }
}
